I did some reading and found the install instructions..
White pigtail goes to the Neutral buss from the breaker. The red and black for 240v use will come off of the breaker to the device your powering. If your using 120v the 120v whit wire needs to go back into the breaker.. If you have a 10a breaker feeding that 50a absolutely you need to change that. these dont need to be replaced if the breaker trips just reset them..
http://www.arcadvisor.com/pdf/DEH-40456.pdf